?pport for incandescent-lamp filaments.



H. WJJAGKSON.

SUPPORT FOR INCANDESCENT LAMP FiLAMENTS,

APPLICATION man mums, 1902.

stance is embedded in the enlargement, '7, while the ends of the V extend outward as shown to form the needed support. 1 o the enlargement, S a-re secured three fiat springs, 11, 12 and 13, each being bent over near its outer end and attached to one.

or the other of three rings, 14, 15 and 16, as shown. The rings, 14,15 and 16, maybe replaced by other shapes,but in any case the mass of the support and its surface oi contact are made such that the filament will not fuse to the support. With thoria' as the supporting substance, the danger of such fusion is still further lessened, inasmuch. as this substance is a good electrical insulator and has a 'high-meltinglpoint.

oxide, most of which mi'ghthe substituted for thoria without departing tromthe spirit of the present invention. 7

.JlTracing theiucandescenoe element from the end connected with the support, 4:, it

will beseen that the filament, 2, passes first to and throughthe ring, 14-, back to one end of the support, 9. The filainent, 22, joined to the other end of the saidsupport, passes to and through the ring, 15, back to one end of the support, 10. Finally, the filament 222, joined to the oppositeend of the support, 10, passes to and through the ring, 16,

ofbrea kage tha'nwhen the, filaments are rigidly supported as is now the custo Moreover, with spring supports such as I have'described, allowance is made for the expansion of the filainent under the influonce of' heatl and its contraction after the interruption of the current as well as the normal contraction, observed-in the length filaments commonly The same I, would be true of other so-called rare earth the remainder thereof.

of the' filament as a whole during extended use. I e

It will be understood that the invention may be applied to filaments of'other ma: terial besides tungsten, tantalum, or molybuseful in connection with' ordinary carbon 1 used in incandescent denum, and in some instances may-be found lamps.

It will be further understood thatthe' springs themselves may be widened and shapes, although in practice I usually. prefer thatthe springs and the rings should be made ofdiil'erent materials, or at least from; different pieces of materials and attached:

together by suitable means.-

I claim as'my invention 1. An- 'noandescent lamp comprising a main support, a reverseiy hent'filament, and u a resilient device secured at one end to the support and supporting the bight of the filv ament at its other end, thereby maintaining the'legs of the filament under tension, the ends of the resilient device that are attached to the filament being of greater mass than V 2. An incandescent lamp maintainingthe filament under tension and of adjacent each other the filament.

comprising a ament, and a resilient filament support v v bent topresent a plurality'oi portions new for engagement with 3. An incandescent lamp comprising a fil-. I

ament and a resilient filament support maintaining the filament under tension and bent to present a, plurality of portions thereof adjacent each'other for engagement with the. I I

filament, the said portions being composed of a material having a high melting point:

Signed at New York, in the county of New York, 1 and 4th day of January, A; D. 1908.-

\ Witnesses:

vVVMZ. H. Carlin,

Gnonen H. STOGKBRIDGE.

State ofNew York, this HENRY WQJnOKSOK. I

increased in mass at their outer ends so as to V require no intermediate rings. or other. 

